ReportGenerator

w6/ReportGenerator.java

@@ -0,0 +1,34 @@
+// 报表接口
+interface Report {
+    void generate();
+}
+
+// PDF实现类
+class PdfReport implements Report {
+    @Override
+    public void generate() {
+        System.out.println("生成 PDF");
+    }
+}
+
+// Excel实现类
+class ExcelReport implements Report {
+    @Override
+    public void generate() {
+        System.out.println("生成 Excel");
+    }
+}
+
+// 原有报表生成器 改造后
+public class ReportGenerator {
+    public void generate(Report report) {
+        report.generate();
+    }
+
+    // 测试
+    public static void main(String[] args) {
+        ReportGenerator rg = new ReportGenerator();
+        rg.generate(new PdfReport());
+        rg.generate(new ExcelReport());
+    }
+}